Get Email UpdatesWhat is cost of quality defects? Cost of quality defects is the cost incurred due to poor quality. The cost can be measured as a percentage of lost sales. For many companies, the costs for quality defects amounts up to 40% of total sales turnover. In other words, you can improve your sales by up [...]
Category Archives: Tutorials
What are Hidden Factory, Cost of Quality? The two types of cost of quality – Visible and Hidden
Posted in Tutorials Tagged COPQ, Cost Of Poor Quality, Cost of Quality, Hidden Costs, Hidden Factory, Tutorial 1 Comment
Understanding defect based six sigma metrics: DPO, DPMO, PPM, DPU, Yield
DPO, DPMO, PPM, DPU Definitions – Six Sigma Defect Metrics What Is DPO? What Is DPMO? A unit of product can be defective if it contains one or more defects. A unit of product can have more than one opportunity to have a defect. Determine all the possible opportunities for problems Pare the list down [...]
Posted in Tutorials Tagged Capability Improvement, DPMO, DPO, DPU, Metrics, PPM, Yield Leave a comment
Six Sigma Confidence Intervals Tutorial
When we calculate a statistic for example, a mean, a variance, a proportion, or a correlation coefficient, there is no reason to expect that such point estimate would be exactly equal to the true population value, even with increasing sample sizes. There are always sampling inaccuracies, or error. In most Six Sigma projects, there are [...]
Posted in Tutorials Tagged chi-squared, Confidence Interval for a Mean, Confidence Interval for the Difference between Two Means, Confidence Intervals, Confidence Level, Confidence Limits, Six Sigma Z Confidence Intervals for Means, t Confidence Interval, t Confidence Interval for a Variance, Z Confidence Interval, Z Confidence Interval for Means, Z Confidence Interval for Proportions 2 Comments
DMAIC Process
Six Sigma Engineering A Six Sigma Engineer develops efficient and cost effective processes to improve the quality and reduce the number of defects per million parts in a Manufacturing/Production environment. Six Sigma Engineers determine and fine tune manufacturing process. Once a process is improved, they go back and re-tune the process and reduce the defects. [...]
FMEA Tutorial
Definition of Failure Mode and Effects Analysis Failure Mode The manner in which the product/part or service does not meet the customer’s expectations Effects Analysis A study of the effects of failure on the function or purpose of the product/part or service The customer could be external to the company, or internal (within the company). [...]
Six Sigma Acceptance Sampling Tutorial
Operating Characteristic Curve or The OC Curve The OC curve quantifies the α and β risks of an attribute sampling plan. Below is an ideal OC curve (the bold line) for a situation in which we might want to accept all lots that are, say, ≤ 1% defective and reject all lots that are > [...]
Posted in Tutorials Tagged Acceptance Sampling, AQL, Discrimination, Lot Proportion Defective, LTPD, OC Curve, RQL, Sampling Plans Leave a comment
Six Sigma Tutorial
What Is Six Sigma? Definition Of Six Sigma, Lean Six Sigma Concepts Six Sigma stands for Six Standard Deviations (Sigma is the Greek letter used to represent standard deviation in statistics) from mean. Six Sigma methodology provides the techniques and tools to improve the capability and reduce the defects in any process. It was started [...]